As a non-resident working in switzerland occasionally (maybe 1-2 week every two months) with primary residence in US and paid by the US subsidiary. I was told that I need a short term-120 day work permit to be in Switzerland. Allegedly, visiting employees are supposed to only be here for 8 days in a year.

There is some dispute over whether or not I have to pay taxes here. get swiss insurance, etc

who can point out the fact and the myths in this case?